That's correct, but it's not two DC Fast Charging sessions. It's the equivalent energy of two "full" charges, however that's defined. Could be 200% of the total capacity, but it sounds more likely that it is the equivalent of low battery to 80% twice, or maybe around 150% of battery capacity.
There will soon be a software update for the bZ4X in at least some markets that raises that limit from 2 charges to 3.8. There have been some U.S. bZ4X owners that have stated that they've been told by Toyota that the update will be rolling out here soon, for whatever that's worth. I don't think there's been anything close to official information about changes to the Solterra.
Edit: to fix typo
There will soon be a software update for the bZ4X in at least some markets that raises that limit from 2 charges to 3.8. There have been some U.S. bZ4X owners that have stated that they've been told by Toyota that the update will be rolling out here soon, for whatever that's worth. I don't think there's been anything close to official information about changes to the Solterra.
Edit: to fix typo